1 files changed, 78 insertions, 0 deletions
diff --git a/u-boot/drivers/serial/altera_jtag_uart.c b/u-boot/drivers/serial/altera_jtag_uart.c
new file mode 100644
index 0000000..2980e4d
--- /dev/null
+++ b/u-boot/drivers/serial/altera_jtag_uart.c
@@ -0,0 +1,78 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <asm/io.h>
+#include <nios2-io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*------------------------------------------------------------------
+ * JTAG acts as the serial port
+ *-----------------------------------------------------------------*/
+static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE;
+
+void serial_setbrg( void ){ return; }
+int serial_init( void ) { return(0);}
+
+void serial_putc (char c)
+{
+	while (1) {
+		unsigned st = readl(&jtag->control);
+		if (NIOS_JTAG_WSPACE(st))
+			break;
+#ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
+		if (!(st & NIOS_JTAG_AC)) /* no connection */
+			return;
+#endif
+		WATCHDOG_RESET();
+	}
+	writel ((unsigned char)c, &jtag->data);
+}
+
+void serial_puts (const char *s)
+{
+	while (*s != 0)
+		serial_putc (*s++);
+}
+
+int serial_tstc (void)
+{
+	return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
+}
+
+int serial_getc (void)
+{
+	int c;
+	unsigned val;
+
+	while (1) {
+		WATCHDOG_RESET ();
+		val = readl (&jtag->data);
+		if (val & NIOS_JTAG_RVALID)
+			break;
+	}
+	c = val & 0x0ff;
+	return (c);
+}